Episode 15 recap: Zhang Qing Li destroyed Zhou Luo's reputation.

Liu Xun provided a clue to the police, which was that he had discovered a letter written by a female teacher to Zhou Luo, filled with apologies and expressions of love, leading him to suspect that Zhou Luo was definitely involved with the female teacher and also had feelings for Nan Ya, who was already married. Lin Fang Lu followed this lead and found the school from which Zhou Luo had been expelled. The school authorities informed him that the female teacher's name was Yang Mei and she was their theoretical mechanics teacher. She had a rather cold personality, was still single at the age of forty, but showed special care for Zhou Luo, leading to rumors of a romantic relationship between them.

Lin Fang Lu sought information from Zhang Qing Li about the situation. In order to protect Zhou Luo, Zhang Qing Li lied and claimed that on the night of the incident, Zhou Luo was with him and they engaged in intimate activities. However, Liu Xun took advantage of a moment of distraction and placed a recording device under Zhou Luo's desk, hoping to capture conversations between Zhou Luo and someone else.

Liu Xun confessed to the police that he had set Xu Yi's car on fire and had even momentarily considered killing him. But he accidentally discovered the letter written by the female teacher to Zhou Luo, which expressed remorse for his expulsion and made him suspect an inappropriate relationship between Zhou Luo and the teacher. It was also on the night of the millennium that Liu Xun helped Chen Ling set Xu Yi's car on fire and coincidentally encountered Zhang Qing Li running barefoot with tears streaming down his face.

In Liu Xun's view, the new millennium would not bring any changes to Qingshui Town. The gutter in the toilet would still stink, the despicable people would remain despicable, and ants would always be ants. With so much evidence and clues combined, Lao Chen gradually began to sympathize with Nan Ya, believing that she acted in self-defense and had no suspicious points. Whether it was the bridge case or the Hu Lifan case, they had no direct connection to her. Even the car fire was orchestrated by Chen Ling and Liu Xun. The case could be considered closed.

However, Lin Fang Lu had a different opinion. He believed that Nan Ya's actions were not justified self-defense and that there were similarities between the deaths of Xu Yi and Hu Lifan. Because Lin Fang Lu suspected a complex connection between Zhou Luo and Nan Ya, he personally went to Shanghai based on the clues provided by Liu Xun to investigate the true reason behind Zhou Luo's expulsion from Donghua University, where he had previously studied.

Director He stated that Zhou Luo excelled academically and received a lot of attention from the teachers. Yang Mei, being their theoretical mechanics teacher, had a rather cold personality and was still single at the age of forty. However, she showed special care for Zhou Luo, leading to rumors of a romantic relationship between them. Although the school found these rumors to be baseless and unfounded, the rumors spread widely within the school. Yang Mei made the resolute decision to submit her resignation to the school authorities, and the news reached Zhou Luo's ears. Zhou Luo directly approached the school leaders and got into a dispute with Vice Director Zhang, resulting in him losing his temper and hitting Vice Director Zhang.

Actually, Deputy Director Zhang had a malicious mindset and spoke with vulgar and filthy language, which naturally angered people. The problem was that a student hitting a teacher had a severe negative impact. After discussions, the school decided that Zhou Luo should write a self-criticism letter and apologize to Deputy Director Zhang. He would receive a serious warning but could continue his studies at the school. However, Zhou Luo chose to drop out instead of apologizing.

Later, Lin GuiXiang pleaded with the school leaders, crying and begging for mercy. Considering that Zhou Luo was indeed a talented student, the leaders felt reluctant to take severe measures and instead decided on a medical withdrawal, so as not to close off his future. With the help of Director He, Lin Fang Lu contacted the female teacher, Yang Mei, and discovered that she held a high opinion of Zhou Luo. They had a teacher-student relationship and friendship, completely different from what was described by others.

Even though they had no contact now, Yang Mei believed in Zhou Luo's character and integrity. If Zhou Luo said he witnessed something, then it must be the truth itself. Lin Fang Lu returned to Nanping Town and happened to encounter Zhou Luo on his way back from school. He wanted Zhou Luo to give a direct answer, but Zhou Luo believed that in this world, there are certain things that never have a so-called true answer. The truth only exists in the hearts of those involved, and speaking more about it is useless.

Zhou Luo learned from Chen Jun that the police had found Liu Xun's father's body, and Liu Xun was secretly observing Zhou Luo and the others. Lin Fang Lu left Chen Jun and Jiang Bing Bing in the classroom to gather information, wanting to know their opinions on whether Zhou Luo liked Nan Ya.

Upon hearing this at the door, Zhang Qing Li immediately rushed in and claimed to be Zhou Luo's girlfriend. She even went as far as tarnishing her own reputation to protect Zhou Luo, falsely stating that they were together on the night of the incident and engaged in intimate activities. As a result, Lin Fang Lu did not pursue further questioning and, before leaving, assured her that he would keep it confidential and prevent it from becoming public knowledge.

However, right after they left, Liu Xun returned to the classroom and retrieved a long-hidden recorder from under Zhou Luo's desk, listening to their conversation.